SevenRooms and ResDiary are both hospitality technology companies that offer reservation and guest management systems for a range of hospitality businesses, including restaurants, hotels, resorts, and event spaces. However, there are some key differences between the two:

1. Features: SevenRooms provides a suite of tools for managing reservations, guest data, marketing, and loyalty. ResDiary offers similar features, but also provides additional tools for reporting and analytics, as well as a more robust guest data management system.

2. User interface: SevenRooms has a more complex user interface, but provides a comprehensive set of tools for managing guest data and marketing. ResDiary is known for its user-friendly and straightforward interface, making it easy to manage reservations and guest data.

3. Pricing: SevenRooms charges a monthly subscription fee, while ResDiary charges a monthly subscription fee as well as a per-cover fee for reservations made through its platform.

4. Integration: SevenRooms integrates with a wide range of tools and systems, including point-of-sale systems, marketing tools, and other hospitality technology solutions. ResDiary also integrates with a number of tools, but may have fewer integrations compared to SevenRooms.

Ultimately, the choice between SevenRooms and ResDiary will depend on the specific needs of your business. If you're looking for a more comprehensive solution for managing your hospitality business, SevenRooms may be a better choice. However, if you're looking for a user-friendly solution for managing reservations and guest data, ResDiary may be the best option.